.header{
    height: 60px;
    width: 100%;
    background-color: black;
}
.banner{
    margin-top: 60px;
    height: 860px;
    background-color: yellow;
}
.content{
    height: 1883px;
    background-color: blue;
}
.footer{
    height: 396px;
    background-color: red;
}